Among the recent threads that nearly touched off another editor war, I wanted to mention that I've recently switched from using emacs to sublime text. (Although I still use emacs for complicated macros.)
I was happy to find this sublime text package for Lilypond, and wanted to let others know about it if you were not already familiar. Not sure if the author is on this list or not.
https://github.com/yrammos/SubLilyPond by Yannis Rammos.
It has been a good start, and I suspect it could be improved by adding bindings that aren't in my theme.
Wouldn't it be nice to enter music by hand?